The composition of brown ring in nitrate test is
Correct answer: C. FeSO4.NO3
- A. FeSO4.NO
- B. FeSO4.NO2
- C. FeSO4.NO3
- D. PCl5
Explanation
Formation of the Brown Ring:Reaction between ferrous sulfate (FeSO4) and nitrate ions (NO3-):2FeSO4 + 2HNO3 → 2Fe(NO3)2 + H2SO4 + SO2Reaction between ferrous nitrate (Fe(NO3)2) and concentrated sulfuric acid (H2SO4):6Fe(NO3)2 + 3H2SO4 → 3Fe2(SO4)3 + 2HNO3 + 4H2O + 2NOFormation of the brown ring complex (nitrosyl ferrous sulfate):[Fe(H2O)6]SO4 + NO → [Fe(H2O)5(NO)]SO4 + H2O
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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